Suggested by iKnowledge Dutch is a pretty tough guy and certainly a dangerous marksman with a gun. That being said, he’s not quite ready to handle Joker. Sure, he would possibly have the edge in a 1 on 1 gunfight with standard weapons, but that’s not enough to overcome the Joker. Joker has a lot of fancy gadgets at his disposal like his explosive marbles and acid blasters. Dutch will quickly be overwhelmed here and can’t deal with Joker’s unpredictable nature. Joker wins.
DReager1.com 
If Dutch can kill the Joker, here’s what he can look forward to:
The acclaim of some citizens of Gotham for killing the Joker. Their insanity doesn’t fly in Roanapur, it being bad for business. People will even draft a petition for an award to be granted to the Black Lagoon Company as a result.
CNN: Black Lagoon Company: New Heroes for Gotham?
The Daily Planet: Is Batman useless now?
Among other headlines.
I like how the Daily Planet cuts right to the heart of this. They’re always ready to knock Batman down a few pegs